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3967
Ropes
Very easy
3968
Square root
Very easy
3969
Diplomas
Very easy
3970
Mutants
Easy
3971
CosmoCraft
Easy
3972
Covered Walkway
Easy
3973
Double Dealing
3974
The End of the World
3975
Estimation
3976
Juggler
3977
Red/Blue Spanning Tree
3978
The Red Gem
Hard
3979
Science!
3980
The Worm in the Apple
Hard
3981
From adjacency matrix to adjacency list
3982
From adjacency list to adjacency matrix
3983
Mancunian And Colored Tree
Very easy
3984
Sum of Squares with Segment Tree
Very easy
3985
Half-degrees of vertices
3986
Sources and sinks
3987
Complete graph
Very easy
3988
Transitivity of a graph
Easy
3989
Hanoi tower
Very easy
4000
Depth Search
4001
Area of the room
Easy
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